code: def testSize(self):
      signal = list(range(100))
      self.assertAlmostEqualVector(
          PowerSpectrum(size=54)(signal),
          [x**2 for x in Spectrum()(signal)],
          1e-6,
      )
  
file_path: essentia/test/src/unittests/standard/test_powerspectrum.py
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestPowerSpectrum obj's underlying member method code with example usage: obj.testSize() without return types